Machine tool



G. A. CHANDLER MACHINE TOOL Filed June 9, 1943 2 Sheets-Sheet 1 FIG. 2

FIG. I

INVENTOR. GEORGE A. CHANDLER ATTORNEY 1944- GJA. CHANDLE 2,356,651

MACHINETOOL Filed June 9. 1943 2 Sheets-Sheet 2 INVENTOR. GEORGE A. CHANDLER I ATTORNEY Patented Aug. 22, 1944 UNITED STATES PATENT OFFICE MACHINE TOOL "George A. Chandler, Muncie, Ind. Application June 9, 1943, Serial No, 490,381

5 Claims.

This invention relates to tool holding devices of the type that are adapted to be used in connection with boring machines and-thelike.

The object of my-invention, broadly stated, is to provide a mechanism applicable to a machine of the above description, whereby operations either of boring, or of facing, may be performed with facility, speed, and precision. The said general object, as well as other and more specific aims, as will presently appear, and which said aims are devoted to improvements in construction and organization leading to economy of manufacture, practicability of installation and use, and to dependability and-efficiency in performance, are accomplished by, and the invention is embodied in the new construction, combination and arrangement of parts described in the following specification and illustrated in the accompanying drawings. 7

In the different viewsin the drawings, the several parts of the inventionare identified by suitable characters of reference applied to them.

In the drawings,

Figure 1 is a side view of my invention as it appears when installed in connection with a conventional spindle and sleeve arrangement common to boring machines,

Figure 2 is a side View of the invention, in the direction of arrow 2 in Figure 1.

Figure 3 is a reverse view of Figure 1, the shank portion of the device being broken away.

Figure 4 is a top plan viewing the sleeve clasp and connected parts removed from the installed position, and as seen in the direction of arrow 4, and on the broken line 1-4 in Figure 1.

Figure 5 is a sectional top plan view, taken on the broken line 55, in the direction of arrow 5 in Figure 1.

Figure 6 is an enlarged vertical central sectional view taken on the broken line 66, in the direction of arrow 6 in Figure 1, portions of the device being shown inv elevation.

Figure 7 is a top plan View taken on the broken line 1'l, in the direction of arrow 7 in Figure 6, portions of the 'ring gear being shown in cross section. h

Figure 8 is a vertical cross section view taken on the broken line 8-'8, in the direction of arrow 8 in Figure '7, a portion of the body, and the lower portion of the shank thereof being shown in elevation.

The embodiment of my invention, as it is herein illustrated ancldescribed, and which may be the form and arrangement adapted for-use in connection with a machine (not shown) of the type wherein a head structure which is movable toward and from the work, carries a spindle sleeve B within which is a rotatively driven spindle C, and in which said spindle is secured, as by a conventional chuck or collet D, the cutter implement or device desired to be used.

Cylindrical metal body H, preferably of machine st'eel, embodies central neck l2 at the base of which is annular seat l3. A lateral recess !4 in said neck, as indicated in Figure 7, will be presently referred to. Provided in said body is a longitudinal central cleft I! which constitutes a central space for the accommodation of the certain parts presently to be described, and by which said cleft the body is rendered into divided formation, the opposite sides of said body being designated by the numerals l5 and I6. Formed in said body, at a location in alignment with the crotch or top portion of said cleft, and in position spaced from the axis of said body, is a ring shaped bearing 20 having the inward annular edge 2! and the outward annular edge 22.

Each of the opposed inner faces ofsaid wall sides l5 and [6 at the mouth portion of said cleft, is of rabbeted formation in cross section, there thus being formed the diametrical slideway 25 in parallelism with the said bearing 20.

An assembly which I designate as a ring gear, consists of annular band 26 having peripheral groove 21, internal annular seat 28, and downwardly disposed annular flange or lip 29, and an internally toothed ring 30, which is secured within said'band at the seat 28 thereof, as by a pressed fit or by suitable lock screws 3|.

, -The said-toothed ring rests slidingly on the annular seat I3, and the lip 29 of said band, slidingly engaging, as it does, the marginal portion of the said body, retains the said ring gear in position journaled on and concentrically with said body.

-A shank 34 of conventional formation as indicated in the drawings and-having base flange 35, has central integral stud 3i; threaded in a central socket therefor provided in the neck of said body, the said flange functioning to retain the saidring gear against longitudinal displacement.

A metal bar having itsend portions bent into arcuate formation, and at its middle being bent at lines spaced from its center, at a right angle and thence in parallelism, constitutes a clasp with base portion 39, and opposed arms 40 (see Figure 4) the inner face of each being provided with an adherent lining such as a leather shoe 4|. By a binding screw 42 which interconnects the sides of said base portion 39, the arms of said clasp are drawn to and are held fast to the spindle sleeve B of the machine (not shown).

A bolt 43 which is passed through the base portion of said clasp and through a hole therefor in the upper portion of the support bar 45 secures these members together. In the lower portion of said support bar is a slot 46.

A metal bar having its end portions bent into arcuate formation, and at its middle being bent at lines spaced from its center and at a right angle and in parallelism, constitutes a grip device with base portion 49, and with opposed complemental arms 58. The inner face of each of said arms is provided with a leather shoe of suitable formation in cross section, and which said shoes are adapted to engage the peripheral groove 21 of the said ring gear. By means of a thumb screw 52 which interconnects the sides of said base 9, the said arms may be drawn toward each other and into holding engagement with the said ring gear 25, or may be expanded to position disengaged from said ring gear. The said grip device is secured at its base portion 49, by a cap screw 53 at the slot 46 of the support bar 45, at a plane coincident with the groove 21 of said ring gear, as indicated in Figure 1 of the drawings.

For a clear understanding of the construction and functions of the several working parts, reference may be had to Figures 6, 7, and 8. A feed screw 55 embodies machined axial boss 56, axial stem 51, and annular shoulder 58. In the outer end of said feed screw is wrench socket 59, and in the other end of said feed screw is threaded aperture 68. Journaled on said boss 56 and in running engagement with said shoulder 58, is a worm wheel 62. In its body portion are spaced holes'6-3, each of which is equidistant from the center of said worm wheel.

A hub 65 is journaled in said bearing 20, and is provided with annular flange 56 which is in running engagement with the inward annular edge 2| of the said bearing. In axial bore 6'! of said hub is received the stem 51 of said feed screw. A longitudinal perforation 68 provided in said hub is spaced from the axis thereof so as to be in registration with the circle bisecting the centers of the holes 63 of said worm wheel. A circular hub cap plate H1 is provided with a central aperture through which a cap screw H is passed and is screwed into the threaded aperture 60 of the said feed screw. The said cap plate '50 thus is drawn to and is held in secure union with the outer end of said hub, and the hub, in turn, being held in secure union with the boss 56, it is fixedly secured to and united with the said feed screw.

In a threaded hole therefor in said cap plate Til is an engagement or coupling pin i3 which is received in the perforation 68 of said hub. Said coupling pin, in the retracted or neutral position (see Figure 6) is clear of the said worm wheel 62. a

It will be seen that by the combination and arrangement of parts just described, the assembly consisting of the hub, the cap plate 10, and the feed screw, is rotatively mounted diametrically of the body H, and the said worm wheel 62 is free rotatively on said feed-screw.

On the exterior face of the hub cap plate H1 are graduations 0 to 50, and on the peripheral face of the body H, is the index I. Similarly, on the band 26 of the aforesaid ring gear (see Figure '7) are graduations 0 to 50, and on the shank flange, is the index I (see Figure 6). These features will presently be referred to.

At the upper end of a shaft 15 (see Figure 8) is integrated a pinion Hi, and at the lower portion of said shaft is integrated a worm 11. Upon placing the said shaft in the vertical bore 18 and the counterbore I9 therefor provided in the body II, the worm T! will have come into mesh with the said worm wheel 62, and the pinion 16 (clearing the recess I4 of the neck of body. II)' will have come into'mesh with the ring gear 39. By this arrangement it will be seen that in the rotating of the said body, (so long as the ring gear is carried thereby in its idle status) the pinion,

- worm, and feed screw are idle, but upon coupling the hub to the worm wheel, and upon a holding of the ringgear against its being carried idly, there results, upon the rotating of the body II, the actuation of the pinion, worm and worm wheel and (through the hub 10) the rotation of said feed screw.

designates a tool carrier. Its sides are of dovetailed formation to fit slidingly in the sides of the slideway 25 of said body II. A cross head 8| embodied with said carrier, as by being seated in a recess 82 therefor, is secured fixedly, as by cap screw 83. In said cross head is a transverse recess 84. The said cross head 8| is threaded on said feed screw, and when at the inboard or central position appears as indicated in Figure 6, the tool carrier being likewise in central position. In the bottom. of said tool post carrier is a longitudinal T slot 85 in which is received the flanged head of tool post 86 and which latter is secured at adjusted position by the usual grip nut 81.

Lubrication for the several movable parts is made-convenient by the providing of hole33 through the base of shank 34, and by a central duct 14 through the shaft 75, as indicated by the broken lines in Figure 8.

The said feed screw 55, when in the status as indicated in Figure 6 (its hub being uncoupled from the worm wheel 62) may be manually op erated to pose the tool carrier at any position desired in the slideway.

Interconnecting the sides l5 and I6 of the said body II, is a cross screw 90 and which is positioned at a plane coincident with the plane of the recess 84 of the cross head of the tool carrier. The said cross screw functions as a stop to arrest the outboard travel of the tool carrier when the latter will have neared the limit or end of the slideway; and it also enables the straining inwardly of said body sides when it is desired to lock the tool carrier in a fixed position in said slideway, as in the operation of plain boring.

Installing the invention, in a typical arrange 'ment, as depicted in Figures 1 and 2, consists of tightening the arms of the clasp to united relationwith the sleeve 13 of the machine (not shown). Shank34 is secured in the machine spindle, as by the collet ring D. Arms 50 of the grip device are in the expanded or open position and apart from the ring gear band 26.

In readiness for the operation simply of boring, the several parts of the invention are in the relative positionsas indicated in the drawings (see Figure 6). It will be understood that the tool post'86 may be set and fastened at any desired position in the T slot of the carrier 80. Likewise the carrier may be set at any desired position in its slideway. Ring gear 26-30 being idle, the

vertical shaft 15 and its worm 11 also are idle. The drive is directly through the body I l, to the carrier 80. 1 a

Preliminary to operating the invention for the purpose of performing a facing operation, the coupling pin 13 is screwed to projected position with its end engaged in one of the holes 63 of the worm wheel 62. The machine (not shown) is now set in motion, and through its spindle C and the shank 34, the tool body being now driven rotatively. The operator now, by thumb screw 52 tightens the grip device, the arms 50 thereof holding the ring gear stationary. Now, by the power exerted by the rotating body, the said feed screw 55 (through the pinion I6 and worm 11) is moved rotatively, and the tool carrier accordingly is moved outwardly from the central position, such movement being concurrent with the rotative movement of the body member. As the rotation of the body H continues, the range traversed by the tool gradually increases. The distance of the travel of the carrier, is limited by the lug block of the carrier having come into engagement (at its recess 84), with the cross screw 90, the ring slipping at the shoes i of the grip device, if the operator will not have already opened said grip device.

The facing out having been completed, the machine is stopped. The operator (conveniently, with a suitable socket wrench) backs the coupling pin 13 free from said worm wheel 62. Then (conveniently with a suitable wrench) the feed screw is rotated until the carrier 80 will have been returned to its initial position and in readiness for another operation.

If in this next operation, it may be intended to face off an area of increased dimension, that is to say, a range beyond the first out, then, preliminary to setting the machine in motion, the tool post is re-set at an outboard position in the T slot of the carrier, whereby the tool is in readiness to continue further and outward cut. Obviously my invention is useful also for operations of undercutting, in which event, the work is held in position with relation to the special cutter retained in the tool post.

To facilitate the obtaining of accuracy of setting the carrier for a boring operation of predetermined diameter, the operator may have reference to the markings on the dial hub cap 10. For extremely precise adjustment of the position of the carrier, reference is had to the graduations on the ring gear band, as indicated in Figure '7.

The advantages afforded by my invention, and wherein I accomplish the feeding action of the tool by mechanical power, are obvious. The friction power feed feature (the grip device acting on ring gear) enables the operator to feed the cutting tool uniformly across the work surface. The feed can be stopped or started instantly. This power feed may be had, by using the clamp device equipment (for the long cuts), or by the operator merely holding the ring gear by hand as the body H rotates (for shorter cuts in facing operations). In this latter instance there is not involved the use of the clasp and grip device, and the installing of the invention consists simply in inserting the shank in and making it fast to the spindle.

It will be observed that when the ring gear is not held stationary, as is the case in the operation of plain boring, the said ring gear simply revolves with the head. Upon holding the ring gear against movement, the carrier is caused to move radially, the tool post being accordingly carried toward or away from the axial center of the head for performing the operation of facing or undercutting. The carrier being retained in close fitting sliding relation with the slideway therefor, and the tool post being held rigidly in the carrier, the smooth and positive action of the worm and worm wheel are effective in moving the tool firmly, smoothly and steadily across the work surface. The tool post being capable of adjustment to and of being made secure at any desired position throughout the length of the T slot in the bottom of the carrier, the operator is enabled to at one set-up adapt the invention for borings of small or large diameter, or for facing larger areas, and in which instance, the tool post may be set at the outboard end of the T slot, when the carrier is in extended position at the extreme end of the feed screw.

In operations wherein the continuous feed of the tool is not desired, such as in straight boring or finishing and when the extent of the travel of the tool is limited, the invention is used without the employment of the grip device. In such an instance the operator manually holds the ring gear against movement, and thereby is enabled to stop the travel of the carrier in the slideway instantaneously and at any moment desired. By using the dial l0, calibrated as it is with the gear ratios shown, the operator is enabled to register a tool movement of one thousandth of an inch. And by using the readings on the gear ring band, there is registrable a tool movement of one ten-thousandth of an inch, the graduations on said hub dial I0 and the ring gear band 26 (see Figures 3 and 7 respectively) being on each, 0 to 50. r

It is considered and will be understood that my invention is not limited to the exact details shown and described, and that it includes such modifications and variations as may fall within the scope of the claims.

What I claim as my invention is:

l. A boring and facing head comprising a rotatable body provided with a. longitudinal diametral cleft, there being formed in said body, at a position spaced from the longitudinal axis thereof, an annular bearing whose axis is coincident with the transverse axis of said body and whose diameter is less than the width of the said cleft, and the opposed inner faces of said cleft being of formation constituting at the mouth portion of the latter, a slideway in parallelism with the said bearing, a ring gear journaled concentrically on said body, a hub journaled in said bearing and having a flange to engage the inboard lateral face of said bearing, said hub being provided with an axial bore, a

feed screw embodying an axial boss and stem,

a gear wheel journaled on said boss, and the stem of said feed screw being received in the bore of said hub, gearing intermeshing With the gear wheel and said ring gear, means to fixedly secure the hub to the boss of the feed screw and to retain it against longitudinal movement in said bearing, a device carried by said means and which is manually operable to couple the hub to said gear wheel, and to uncouple the hubfrom said gear wheel, a tool carrier retained movably in said slideway and which is threaded on said feed screw, whereby while the'hub is uncoupled from said gear wheel, the carrier is capable of being manually set, and is retainable in adjusted position on said feed screw, and during the rotating of the body is swung in a circular path, and

axis is coincident with the transverse axis of said body and whose diameter is less than the width of the said cleft, and the opposed inner faces of the sides of the body being of formation to constitute, at the mouth portion of said cleft, a rabbeted diametric slideway in parallelism with saidb-earing, a ring gear journaled concentrically on said body, a hub journaled in the said bearing and having a flange to engage the inboard lateral face of said bearing, said hub being provided with axial bore, a feed screw embodying an axial boss and stem, a gear wheel journaled on said boss, and the stem of said feed screw being received in the bore of said hub, gearing intermeshing with the gear wheel and said ring gear, means to fixedly secure the hub to the boss of the feed screw and'to retain it against longitudinal-movement in said bearing, a device carried by said means and which is manually operable to couple the hub to, and to uncouple it from said gear wheel, a tool carrier having its sides of dovetail formation to fit slidingly in the said rabbeted slideway, a cross head provided on said carrier and which is threaded on the said feed screw, and a transverse manually operable screw interconnecting the sides of said body at a plane above the slidewa and in the path of the cross head of the tool carrier and adjacent the perimetral portion of said body, to limit the outward travel of said tool carrier when facing operations are being performed, and to enable the sides of said bodyto be tightened against the sides of said tool carrier to grip the latter at fixed position when plain boring operations are being performed.

3. A machine tool mechanism of the kind described, comprising a rotatable body provided with a'longitudinal diametral cleft, there being integrated with said body, at a position spaced from the longitudinal axis thereof, an annular bearing whose axis is coincident with the diametric axis of said body, and the opposed faces of said cleft being of formation constituting at the mouth portion of the latter, a slideway in parallelism with the said bearing, an annular band embodying an internal ring gear journaled concentrically on said body, an axiallybored hub journaled in said bearing and retained against 7 longitudinal movement therein, a feed screw embodying an axial extension that is received in the bore of said hub, a Worm wheel journaled on said extension, a shaftjournaled in said body said shaft embodying a worm meshing with said worm wheel, and a pinion meshing with said internal ring gear, a device carried by said hub and which is operable to couple the hub to and 'to uncouple it from the said worm wheel, and a tool carrier retained slidingly in said slideway and embodying a cross head that is threaded on said feed screw.

4. A mechanism according to claim 3, the said worm wheel being provided in its body portion with spaced holes each of which is equidistant from the center of said wheel, and the said hub being provided with a longitudinal perforation to register with the circle bisecting the holes in said worm wheel, and a coupling pin retained in said perforation and which is manually operable to engagement with, and to disengagement from one of the holes of said worm wheel.

5. A boring and facing mechanism of the kind described, comprising a cylindrical body provided with a diametral cleft, there being formed in said body, at a position spaced from the longitudinal axis thereof, an annular diametric bearing jutting into the crotch portion of said cleft, and the opposed inner faces of said cleft being rabbeted to constitute, at the mouth portion of the latter, a diametric slideway in parallelism wth said bearing, a ring gear journaled on said body, a shank secured axially of said body and being adapted to be secured in the machine spindle, a hub journaled in said bearing and having a flange to engage the inboard lateral face of said bearing said hub being provided with axial bore, a feed screw embodying an axial boss and stem, a worm wheel journaled on said, boss and having in its web spaced holes each of which is equidistant from the center of said Wheel, and the stem of said feed screw being received in the bore of said hub, a cap plate for the outer end of said hub, means to secure the cap plate to the hub, and the hub to the boss of said feed screw, a threaded coupling pin carried by the'hub and which is manually operable to engagement with, and to disengagment from one of the holes in said worm wheel, gearing intermeshing with the worm wheel and the said ring gear, a tool carrier retained in said slideway and having a longitudinal T slot in the bottom thereof, a clasp adapted to be fastened to the spindle sleeve of the machine, and a grip device supported by said clasp and which is manually operable to and from holding engagement with said ring gear.

GEORGE A. CHANDLER. 

